Multiuser transmission diversity and relay method and system

A sub-system and multi-user technology, applied in the direction of frequency division multiplexing system, time division multiplexing system, diversity/multi-antenna system, etc., can solve the problems of poor transmission reliability, increased hardware cost, and no consideration of transmission reliability and other issues, to achieve the effect of low demodulation complexity, improve transmission reliability, and ensure transmission effectiveness

Inactive Publication Date: 2007-12-05
NTT DOCOMO INC
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Problems solved by technology

Multi-antenna systems can effectively improve the effectiveness and reliability of wireless communication systems, but this method requires more antennas for the transmitter and receiver, which increases hardware costs and is not conducive to the miniaturization and miniaturization of mobile devices
[0009] In addition, in a multi-user multi-channel wireless communication system, the traditional transmission and relay methods assign channels to each user individually, and each user uses an independent channel to transmit its signal, which is difficult to resist channel fading, so its transmission reliability is poor ; Larson et al.’s coded two-way relay method superimposes the signals sent by two users at the relay station by means of modulus two addition, and uses a relay channel for transmission. Compared with traditional relays, every two users One less channel can be used, which improves the effectiveness of transmission
However, the relay method of Larson et al. does not consider the reliability of the transmission

Method used

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  • Multiuser transmission diversity and relay method and system
  • Multiuser transmission diversity and relay method and system
  • Multiuser transmission diversity and relay method and system

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Embodiment Construction

[0028] The method and system for multi-user transmit diversity and transmit diversity relay in a wireless communication system as an embodiment of the present invention will be described in detail below with reference to the accompanying drawings, and details and systems unnecessary for the present invention are omitted in the description process functions in order to prevent confusion in the understanding of the present invention.

[0029] As an embodiment of the present invention, first consider the situation that two users in a wireless communication system realize two-way communication through a relay station. FIG. 4 shows a schematic diagram of the transmit diversity relay process of this embodiment in the case of two users.

[0030] In order to improve the transmission reliability of the wireless communication system, it can be considered to use 4 channels. Different from the traditional method, the relay station does not use two relay channels to transmit the signals o...

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Abstract

The invention relates to a multi-communication terminal transmit diversity and transmit diversity relay method in wireless communication system, comprising the steps: multiple communication terminals use their respective source transmission channels to transmit signals; signal gathering point receives these signals and makes linear conversion on these signals and uses multiple channels to transmit linear converted signals, where each channel in multiple channels transmits a linear combination of signals transmitted by multiple communication terminals; and at the receiving end, demodulating the signals transmitted by the signal gathering point.

Description

technical field [0001] The present invention relates to a method and system for multi-user transmission diversity and relaying, more specifically, to a method and system for realizing transmission diversity and relaying by joint coding at a signal convergence transmission point in a multi-user multi-channel wireless communication system, Therefore, the effectiveness and reliability of the wireless communication system are improved. Background technique [0002] In the wireless mobile communication system, the signal transmitted from the mobile station or the base station through the antenna passes through the wireless mobile channel, passes through the complex propagation environment and reaches the receiving antenna at the receiving end. Due to the effect of the propagation environment, the signal received by the receiving antenna is a composite of reflection, diffraction and scattering components and channel noise, which will cause serious distortion. In addition, in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/02H04B1/707H04B1/7105H04B7/06H04J1/00H04J3/00H04L1/22H04W16/26H04W16/28H04W88/04
Inventor 李祥明李安新王明曙加山英俊
Owner NTT DOCOMO INC
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